I installed that, and as long as Trillian 3.1 isnt running, ALT-TAB works ok, so obviously it's a setting within Trillian 3.1 that must be disabling it, or so I would assume. HMMM!!!
Also, curious about this patch exe...What's up with when I now ALT-TAB I see a preview of what I'm switching to when I used not to? Nothing wrong with it, I think I actually like it better, but all the same....interesting.